This timely book focuses on understanding and neutralizing the threat of nuclear terrorism. The first part addresses the questions of who could be planning an attack, what weapons and materials are available to them, as well as where those items could be acquired, when they could be used, and how they might be delivered. The second part outlines an ambitious plan to prevent terrorists from ever detonating a nuclear weapon in the United States. The author details events associated with the disappearance or loss of nuclear materials and weapons worldwide, as well as current efforts to control and inventory those dangerous items. An appendix contains answers to frequently asked questions about nuclear terrorism.